Lost Sierra Endurance Race
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Event overview
The Lost Sierra Endurance Race takes place Saturday, July 25, 2026, in Downieville, CA. Distances offered are:
- 100K - Out-and-back, Downieville to Plumas-Eureka State Park turnaround.
- 50K - Point-to-point, Plumas-Eureka State Park to Downieville.
- 25K - Loop course starting and finishing in Downieville.
Registration closes Thursday, July 23, 2026 at 11:59 PM PT. A post-race party is held at the finish area.
Courses and logistics
100K: Out-and-back route using Third Divide, Pacific Crest Trail, and Lakes Basin Trails. Listed aid stations occur at miles 5.3, 15.2, 20.1, 25.6, 29.8 (turnaround) and the corresponding return miles; five unique aid stations and nine total stops are noted. Mandatory items for 100K include a headlamp, space blanket, and a vest or pack; a water bottle is also referenced. Pacers are allowed on the return at Aid #5 (about Mile 30) or Aid #2 (about Mile 47); there is no event shuttle for pacers. Cutoff for the 100K is 20 hours.
50K: Point-to-point from Plumas-Eureka State Park into Downieville. Four unique aid stations are listed; crew access is available at Lavazzola Road (about mile 23). Runners are shuttled from Downieville to the 50K start; shuttle cost is $12. Cutoff for the 50K is 11 hours.
25K: Loop on First, Second, and Third Divide Trails with a water stop at mile 4.2 and a formal aid station at Lavazzola Road (mile 10.9). All distances permit use of running poles.
The event notes a community donation program that matches participant donations up to specified limits and lists several nonprofit partners. Visit the organization's website for the most recent information.